OLD

#define ECHO_CAN_KB1
/* MG2 is a version of KB1 that has some changes to it that are
 * supposed to improve how it performs.  If you have echo problems,
 * try it out! */
/* #define ECHO_CAN_MG2 */

NEW

/* #define ECHO_CAN_KB1 */
/* MG2 is a version of KB1 that has some changes to it that are
 * supposed to improve how it performs.  If you have echo problems,
 * try it out! */
#define ECHO_CAN_MG2